Umbrella



FIG. 1 is a top plan view of an umbrella showing our new design;

FIG. 2 is a right side elevational view of the umbrella rotated 90° counter clockwise;

FIG. 3 is a left side elevational view of the umbrella rotated 90° clockwise;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof in inverted position; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for an umbrella, as shown and described. 